Bug 37465

Fix: 

Add the following section to 3. Unix Basics

Console Navigation

Here are two simple techniques that can make using FreeBSD much more
powerful and enjoyable.

Alternate Consoles

The key combinations ALT-F1 through ALT-F6 give you simultaneous
parallel channels of access to the sytem, much as though you could seat 
yourself at any one of six different keyboard-monitor sets, each
with its own communication path to FreeBSD.  This can be useful
for simultaneously editing a file and observing the effects of
executing it or for examing the messages in stderr without disturbing
your main channel of communication with the system.

Scrolling the console text display.

Pushing the scroll lock key (on the upper right of your keyboard)
lets you use the arrow keys or the page up and page down keys to
navigate through the console text display, allowing access to portions
that have scrolled off the top of the monitor.  Pushing scroll lock
again restores normal display operation.